Header to sump clearance

Hi everyone, happy new year , I hope you all had a great holiday period. I installed new new hpc long tube headers to replace the block huggers I had. They were designed for a c3 corvette and fit in my truck really well except for one small area the size of a quarter with rests on my high performance sump. It brings me to ask what is an acceptable clearance for a header to sump? I will most probably use some header spacer flanges to gain 10mm as I don’t want to dint the headers or the sump. Thoughts?
 

keep in mind the car frame suspension and exhaust header clearance issues when designing the custom oil pan,or fitting headers in a car.
yeah a 3/8" thick steel header spacer plate sandwiched between the header flange,
or exhaust manifold and cylinder heads exhaust port
this is a rather common way to get the required clearance,
without having to bend and dent the header tubes,
but of course you'll need to test fit too see if that's a valid option in your cars engine bay.

headerfl3.jpg


headerfvb.jpg

should help get you the increased, header tube too oil pan, clearance you need there,
and it should be obvious that the more clearance the better,
(remember these can be machined at a couple degrees angle to provide even greater clearance,
having a local machine shop surface grind the spacer plate at 3-4 degrees can make a very noticeable difference in oil pan clearance)

as you want to reduce the heat transfer, from a hot exhaust header to the engines sump,
as reduced oil temps generally produce better lubrication,
but just as obviously getting the ideal clearance in a fairly cramped engine bay,
can be rather difficult.(as always measure very carefully, and test fit the parts if you can)
 
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